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2.84" (72mm)
0.95"
(24mm)
0.13" (3.18mm) Max
Panel Thickness
2.36" (60mm)
.874"
(22.2mm)
0.16"
(4mm)
2.68: (68mm)
Mounting Requirements
Insert the Mini-Max through the panel, and then slide the mounting bracket on to the Mini-Max. The mounting bracket allows Mini-Max units to be
stacked side-to-side or top-to-bottom and maintain the DIN standard
panel arrangements in 24mm by 72mm multiples. Panel cutout instructions for stacking multiple units are provided under “Stacking Features.”
Minimum Depth Indicator - Less Than 2.5” (60mm) of
Space Required Behind the Panel
Stackable Mounting Bracket Included for
Easy Installation
4-1/2 Digit, 0.5” (12.7mm) High LCD Display with
Optional Negative Image, Bright Red Backlighting
Limited Range Display Scaling
Standard Screw Terminals for Easy Installation
Six Current Ranges: 200µA, 2mA, 20mA, 200mA, 2A,
5A
85-250VAC or 9-32VDC Power Supply
Mini-Max M245 Series Digital Panel Meter
Installation and Panel Cutout
Simpson’s Mini-Max Current Indicators provide high quality,
accuracy and reliability in a compact, 60mm deep case.
Units offer 4-1/2 digit, 0.5” (12.7mm) LCD display and are
available with a bright red, negative image backlight option.
All units feature user-selectable decimal point, auto zero and
limited scaling capabilities.
A unique mounting bracket is provided to allow for vertical
or horizontal stacking of multiple indicators. All Mini-Max
units feature a 3/64 DIN, high-impact plastic case. The
standard units have a clear viewing window, and the units
with optional negative image, red backlighting have a red
window.
DC Current
.88" (22.2mm)
2.68"
(68mm)
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DISPLAY
Type: 7-segment LCD
Height: 0.5” (12.7mm)
Decimal point: 3-position programmable
Overrange indication: Most significant
digit = “1”
Backlighting: Optional negative image, red LED
backlighting
Polarity: Auto with “-” indication, “+” implied
POWER REQUIREMENTS
AC Volt: 85-250VAC @40-440Hz
DC Volt: 9-32VDC
Power Consumption:
85-250VAC: 2.5VA min/4VA max
9-32VDC: 1.5VA min/3VA max
Rated Circuit to Ground Voltage: 750Vrms
ACCURACY @ 25°C
±(0.04% of reading + 1 count)
2A: ±(0.25% of reading + 1 count
5A: ±(0.5% of reading + 1 count)
ENVIRONMENTAL
Operating Temperature: 0 to 55°C
Storage Temperature: -10 to 60°C
Relative Humidity: 0 to 85% non condensing
@ 40°C
Temperature Coefficient:
(⫾ 0.02% of input ⫾ 0.2 digits) / ⬚C
Warmup time: Less than 20 minutes
NOISE REJECTION
NMRR: 60dB, 50/60Hz
CMRR: (w/1K⍀ unbalanced @ 60Hz): 90dB min
ANALOG TO DIGITAL CONVERSION
Technique: Integrating
Rate: 3 samples/second-typical
MECHANICAL
Bezel: 0.95” x 2.84” (24mm x 72mm)
Depth: 2.36” (60mm)
Panel cutout: 0.88” x 2.68”
(22.2mm x 68mm)
Weight: 3.5oz (99.2g)
Case Material:
94-0,UL-rated, glass-filled thermoplastic
Specifications
Wiring Display
Display Scaling
Mini-Max indicators have limited range coarse
and fine adjustments for display scaling.
There are no optional connections required
for these to function. The “coarse” calibration
R12 will allow a limited range of scaling values. The meter can be scaled down to 1/2
the value of the input, but notscaled up.
Maximum scaling is maximum input for a
maximum reading of 1.9999, which ever is
lower. Example: a 2 AMP input has a maximum reading of 1.9999 counts, so cyou can’t
double the 2 AMP’s, but you can make 1
AMP read 1.9999. the “fine” calibration R9
allows for an approximate range of 1% of the
“coarse” calibration. Apply full scale input to
the meter. Adjust R12 to be within 1% of the
desired scaled value, then use R9 to obtain
the final desired result.
Using a screwdriver or thumbnail,
spread tab on each side of case to
unlock top half. Lift rear top half and
slide away from front of meter.
FRONT
OF METER
LOCKING
TA B
TOP HALF
OF CASE
Decimal Point: To select a decimal point, connect the appropriate DP pin (DP1, DP2, DP3 or DP4) to the DP COMMON (HOLD). Unused DP inputs
may remain unconnected (open).
Display Hold: Connect HOLD to DP COMMON (HOLD). If this feature is not required, the DP COMMON (HOLD) pin may remain unconnected
(open). Hold is optional on this model, and when equipped, replaces DP4. This feature is available from our modification centers.
Input Signal: Connect the IN HI and IN LO to the signal to be monitored.
Input Power: Connect power to the L1 and L2 terminals. For AC powered units, L1 and L2 are not polarized.
For 9-32 DC powered units, L1 must be positive with respect to L2.
(Input Signal) IN HI
(Input Signal) IN LO
DP3
DP2
DP1
HOLD
L1 (POS) (Power)
L2 (NEG) (Power)
EX (NEG)
EX (POS)
DP COMMON
(HOLD)
These instruments are designed for maximum safety to the operator when mounted in a panel according to instructions. They
are not to be used unmounted or for exploratory measurements in unknown circuits.
Range Resolution Voltage Max. Input
Drop (unfused)
200µA 10µA 200mV 10mA
2mA 100µA 200mV 40mA
20mA 1µA 200mV 100mA
200mA 10µA 200mV 400mA
2A 100µA 200mV 3A
5A 1mA 50mV 6A
INPUTS: DC Current
DP4/
NNoottee::
Any physcal damage to the meter during
calibration will void the warranty
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Stacking Features
The mounting brackets, included with every Mini-Max, can be connected together. Multiple units can be mounted in a single opening, allowing perfect alignment.
To punch one hole for multiple units, be sure to adjust the standard
panel cutout dimensions as shown here; otherwise the meters will not
fit properly in the hole.
Mounting multiple units is quick and easy. Install the first meter (bottom
unit first if stacking vertically). Position the next mounting bracket snugly against the first one, and slide the second meter into place. Repeat
for remaining units.
2.68" (68 mm)
.071" (1.8 mm)
.88" (22.2 mm)
Standard cutout
Add to standard
when stacking
.88" (22.2 mm)
2.68" (68mm)
Standard cutout
.16" (4.0mm)
Add to standard when stacking
Horizontal
Vertical
Vertical
Horizontal
Excitation Output
Excitation output is available in the Mini-Max for powering external
transmitters or transducers. Excitation is available from the EX POS and
EX NEG terminals. This source is isolated from the measurement input
as well as the input power circuits. The voltages available are 12VDC or
24VDC, with a maximum load current of 25 milliamps. This feature eliminates the need to mount an external DC power source for transducers
or sensors used in your application.
Do not exceed an excitation
load current of 25mA!
EX NEG
EX POS
Backlight Option and Decimal Point Selection
Negative image, bright red backlighting is available in the Mini-Max. This illumination allows the
unit to be read in low light areas. Backlighting
power is supplied by the Mini-Max, so no additional external power is required.
Decimal point selection is accomplished by connecting the appropriate DP terminal to the DP
Common terminal.
DP4
DP3
DP1
DP2
DP COMMON
321 G
(HOLD)
4*
DP 4
DP 1
DP 2
DP 3
*NOTE: If the Display
Hold option is ordered,
it replaces DP4 on the
Terminal Connector.
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Application Example
Ordering Information Safety Symbols
The WARNING sign denotes
a hazard. It calls attention to
a procedure, practice, or the
like, which, if not correctly
performed or adhered to,
could result in personal
injury.
The CAUTION sign denotes
a hazard. It calls attention to
an operating procedure,
practice, or the like, which, if
not correctly adhered to,
could result in damage to or
destruction of part or all of
the instrument.
A company needs to monitor the power
supply voltage and load current of a
12VDC motor.
Voltage: A Mini-Max DC Volt meter, configured for the 20 volt range, is installed in
parallel with the power source. The IN HI
is connected to the positive lead of the
power supply. The IN LO is connected to
the negative lead of the power supply.
Current: A second Mini-Max DC Volt
meter, configured for the 200 millivolt
range, is used with a 100A/50mV shunt
(sold separately) to measure the load current. The meter is first scaled to read
100.0 at 50mV by applying a 50mV input
to the meter and adjusting R9 and R12
until the display reads 100.0. The meter is
connected to the shunt, and the shunt is
installed in series on the negative leg of the
power supply. The positive lead of the
shunt is connected to the IN HI terminal,
Non Backlight
Negative Image Red
Basic Unit Display DPM Power Supply Range Excitation Output
M245
0
2
0
1
0
1
2
21
22
23
24
25
26
4-1/2 Digit Indicator
85-250VAC
9-32VDC
200µA
2mA
20mA
200mA
2A
5A
None
12VDC
24VDC
AC MOTO R
POWER SUPPLY
5 A AC UNIT
200 VAC UNIT
200Hz Frequency Unit
IN HI IN LO
IN HI IN LO
-
+
External shunts enable digital panel
meters to indicate higher currents than
can be provided with self-contained
internal shunt meters. The shunt is
installed in series with the load and
source. The shunts produce a DCmV
drop which is sent to the display unit.
The Mini-Max can be scaled to display
the actual current between the load and
the source. Simpson manufactures
portable and switchboard shunts.
Each shunt includes 5’ leads.
The Mini Max Voltage Indicator can be configured by making an entry for each box
NOTE: Display hold feature is configured at the factory only. Must specify at time of order.
25 DCmA max
output
and the negative lead connected to the IN
LO terminal. The Mini-Max units will indicate the power supply voltage and load
current of the motor.
Portable Shunts 50mV
Amps
1
5
10
15
25
30
50
75
100
150
200
Cat. Number
06700
06703
06704
06705
06707
06708
06709
06711
06713
06714
06715
Switchboard Shunts 50mV
Amps
100
150
200
250
300
400
500
Cat. Number
06500
06503
06504
06505
06506
06507
06508
Accessories
Portable
Switchboard
Ordering Information
SIMPSON ELECTRIC COMPANY 853 Dundee Avenue, Elgin IL 60120-3090 • (847) 697-2260 • FAX (847) 697-2272
www.simpsonelectric.com Printed in U.S.A. Part No. 6-116071, Edition 15, 03/05
NNoottee::
Special scaling is available from the factory at the time of ordering.
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